Cushion tire



1,635 194 July 12, 1927. w. E SHWELY cusHIoN Tina original Filed Nv. a, 192:5 s Shavers-sheet 2 nvmlor imm? E, 5//Mm/ ',ttomey July 12,

original Filed Nov. e, 1923 s sheets-smet 5 INVENTOR @d www Patented July 12, 1927.

UNITEDSTATES A 1,635,194 PATENT oFFlcE.

WALTER E. SHIVE'LY, OF AKRON, OHIO, ASSI-GNOR TO THE GOODYEAR TIRE du RUBBER COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO. Y

cUsHIoN man.

appiieatien med November 8,1923, serial Ne. 678,508. nenewed Jennery 25, 19,27.

Myinvention relates to cushion tires and particularly to rubber tires comprising a cushion body of rubber that is vulcanized to a metal base band and that has an annular internal chamber.

Cushion 'tires of this genera-l class haveA long been constructed with an internal circumferential chamber and with a substantially flat unitary tread surface. The wear to which such tires aresubjected indica-tes that the shoulders or edge portions of the tread are more rigid and non-yielding to road impact than the portions of the tread located directly over the internal chamber and also, that the cushion body could be improved if more uniform distribution of heat could be obtained during vulcanization of the tire.

rl`he object of this invention is to provide means formore uniformly distributing the heat to the tire during vulcanization, providing va tire with improved facilities for dissipating heat generated during operation, and to so arrange recesses in the side walls of the tire as to obtain uniform yielding of all parts of the tread to road impact.

In general this invention contemplates the formation ,'of'a plurality of recesses that extend laterally inwardly from the sidewalls of the tire', but that do not enetrate to the internal cavity of the tire. ne of the functions of such recesses is to permit the'edge portions of the tire to more readily flex under road impact and to thereby provide a tread surface that is uniforml yieldable over every portion. It is well nown that rubber is substantially incompressible and, when the tread surface of the tire is distorted, the rubber must flow back into the side 40 walls of the tire or be absorbed by the yielding of the lateral recesses herein rovided or by an intermediate iow of rub er into these recesses rather than through the thickening of the entire side wall.

46 Fig. 1 of theaccompa-nying drawings is a top plan view lof a portion of the tread face of a cushion tire constructed in accordance with this invention;

Fi 2 is a lateral sectional view taken on 50 line I-I-I of Fig. 1, looking inthe direction of the arrow; v

Fig. 3 is a view in rspxective of a portion of a modified form o cus ion tire constructed, in accordance with this invention;

that is constructed in accordance with con` ventional practice, and a rubber cushion body 2 having an internal chamber 3 that extends circumferentially around the tire.

Anon-skid tread surface 4 is formed by a plurality of intersectin grooves 5 molded into the tread surface o the tire.

This invention consists in forming ay pluralityof laterally extending` recesses 6 and 7 in the side Wall of the tire.

The tread portion 4 of the tire is substantially unitary and com rises a series of diamond shaped tread projections 8 and a series of half diamond projections 9 that merve with the side wall of the tire and Hank t e series of complete diamond `figures. By the use -of the` term unitary tread surface, I

desire to convey the idea of a tread face that is not-circumferentially divided into a number of separated tread portions.

In Figs. 1 and 2, the recesses are shown as directly underlying the half diamond figures of the tread. IThe purpose of this is to reduce the rigidity of the tread at the point where it is most i'igid'in tiresof the type under construction. The distribution of these cavities can be controlled toa large degree by the configuration of the tread and by the thickness of rubber on all sides of the cavity since, in order to get more uniform flow of heat to the material of the tire during vulcanization, it is desirable to have a maximum area of heat conductin metal surface ex osed tothe rubber in t e vicinity of the t ickest portions of the tire in order to. obtain more uniform vulcanization.l By positioning the recesses 6 directly beneat ,the half diamond tread portions at the edge of the tread, the recesses not only serve to more effectively distribute heat to the' rubber of the tire during vulcanization, but

they also materially improve the deecting tread portion.

ualitiesl of the overlyingz E d yare v--posi ione e smaller size recesses under less rigid portions of the tread and Y rovide the previously serve rincipally to P istribution of the heat discussed more even -to the tire body. l

The modification of this invention shown lll in Fig. 3 illustrates an application of this invention to a. tir-e Without particular regard for the configuration of the non-skid tread projections. In this ,form of tire a series of recesses 10 of uniform size and depth are formed in'the side Wall of the tire. In all instances, it is important that these recesses d o not penetrate the internal cavity of the tire.

It will be apparent to those skilled in the art that this invention is capable of many ,modifications and I desire therefore that only such limitations shall be imposed as are indicated in the spirit and scope of the appended claims.

What I claim is:

1. A cushion tir-c. comprising a metal base band, and a cushion body vulcanized thereto having a continuous annular internal chamber, a substantially Hat tread portion and divergent sidewalls each having a plurality of recesses extending substantiallyhaltl way through the side Walls.

2. A cushion tire comprising a' metal base band, and a cushion body vulcanized to said extending laterally inwardly less than the thickness of the side Wall.

4I. A cushion tire comprising a metal base band, and a cushion body vulcanized thereto having an internal annular chamber extending circumterentially thereof and a tread surface composed of non-skid diamond and half-diamond figures, the side Walls 'of said cushion body being substantially weakened by a plurality of lateral recesses positioned directly beneath the halt-diamond tread tigures.

5. A cushion tire comprising a metal base band, and a cushion body vulcanized 'thereto having a continuous annular internal chamber, a substantially flat unitary tread surface having non-skid projections formed by a series of oblique intersecting indent-ures. and lat-eral recesses in the sides of the tire positioned intermediate the ends of adjacent intersecting grooves.

6. A cushion tire comprising a metal base band, and a cushion body vulcanized the-reto having ay non-skid unitary tread surface of diamond shaped rojections `formed by a series of intersectlng indentures, and a series of lateral recesses extending inwardly from the side Wall of the tire and positioned with their axis in the fiateral median plane intersecting the oints of one ot the tread ligures, the dept of said indentures being directly proportional to the distance of the nearest diamond tread button from the side of the tire.

In Witness whereof, I have hereunto signed my name.

WALTER E. SHIVELY. 

